CVE-2020-17518 (GCVE-0-2020-17518)

Vulnerability from cvelistv5 – Published: 2021-01-05 11:40 – Updated: 2025-02-13 16:27
VLAI KEVintel KEV
Title
Apache Flink directory traversal attack: remote file writing through the REST API
Summary
Apache Flink 1.5.1 introduced a REST handler that allows you to write an uploaded file to an arbitrary location on the local file system, through a maliciously modified HTTP HEADER. The files can be written to any location accessible by Flink 1.5.1. All users should upgrade to Flink 1.11.3 or 1.12.0 if their Flink instance(s) are exposed. The issue was fixed in commit a5264a6f41524afe8ceadf1d8ddc8c80f323ebc4 from apache/flink:master.
CWE
  • CWE-23 - Relative Path Traversal
Assigner
References
URL Tags
https://lists.apache.org/thread.html/rb43cd476419… x_refsource_MISC
https://lists.apache.org/thread.html/rb43cd476419… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/rb43cd476419… mailing-listx_refsource_MLIST
http://www.openwall.com/lists/oss-security/2021/01/05/1 mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r28f17e56495… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/rd6a1a0e2d73… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r8167f30c4c6… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r0b000dc0286… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r705fb2211b8… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r5444acac340… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r710693b0d3b… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/ra8c96bf3ccb… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/rfe159ccf496… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r7b2ee88c66f… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/rec0d650fbd4… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/rf8812a5703f… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/rcb9e8af775f… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r88200d2f0b6… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r4a878375188… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r22916753886… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/rd2467344f88… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r90890afea72… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r1125f3044a0… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r26fcdd4fe28… x_refsource_MISC
Impacted products
Vendor Product Version
Apache Software Foundation Apache Flink Affected: Apache Flink 1.5.1 to 1.11.2
Create a notification for this product.
Credits
0rich1 of Ant Security FG Lab
KEVintel KEV
Known Exploited Vulnerability - GCVE BCP-07 Compliant

Vulnerability ID: CVE-2020-17518

Status: Confirmed

Status Updated: 2025-12-05 00:00 UTC

Exploited: Yes


Timestamps
First Seen: 2025-12-05
Asserted: 2025-12-05

Scope
Notes: KEVIntel entry: Apache Flink directory traversal attack: remote file writing through the REST API | Affected: Apache Software Foundation / Apache Flink | CVSS: 7.5 (HIGH) | Used in malware: unknown | Not yet in CISA KEV: True

Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel


Details
Feed KEVIntel (kevintel.com)
Title Apache Flink directory traversal attack: remote file writing through the REST API
Vendor Apache Software Foundation
Product Apache Flink
Added Date 2025-12-05T00:00:00.000Z
Cvss Score 7.5
Epss Score None
Cvss Severity HIGH
Epss Percentile None
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev True

References

Created: 2026-06-19 12:45 UTC | Updated: 2026-06-19 12:45 UTC
Show details on NVD website

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      "sourceIdentifier": "security@apache.org",
      "vulnStatus": "Modified",
      "weaknesses": "[{\"source\": \"security@apache.org\", \"type\": \"Secondary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-23\"}]}, {\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-22\"}]}]"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2020-17518\",\"sourceIdentifier\":\"security@apache.org\",\"published\":\"2021-01-05T12:15:12.367\",\"lastModified\":\"2024-11-21T05:08:16.340\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Apache Flink 1.5.1 introduced a REST handler that allows you to write an uploaded file to an arbitrary location on the local file system, through a maliciously modified HTTP HEADER. The files can be written to any location accessible by Flink 1.5.1. All users should upgrade to Flink 1.11.3 or 1.12.0 if their Flink instance(s) are exposed. The issue was fixed in commit a5264a6f41524afe8ceadf1d8ddc8c80f323ebc4 from apache/flink:master.\"},{\"lang\":\"es\",\"value\":\"Apache Flink versi\u00f3n 1.5.1, introdujo un controlador de REST que le permite escribir un archivo cargado en una ubicaci\u00f3n arbitraria en el sistema de archivos local, por medio de un encabezado HTTP modificado maliciosamente.\u0026#xa0;Los archivos se pueden escribir en cualquier ubicaci\u00f3n accesible de Flink versi\u00f3n 1.5.1.\u0026#xa0;Todos los usuarios deben actualizar a Flink versi\u00f3n 1.11.3 o 1.12.0 si sus instancias de Flink est\u00e1n expuestas.\u0026#xa0;El problema se corrigi\u00f3 en el commit a5264a6f41524afe8ceadf1d8ddc8c80f323ebc4 de apache/flink:master\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6}],\"cvssMetricV2\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"2.0\",\"vectorString\":\"AV:N/AC:L/Au:N/C:N/I:P/A:N\",\"baseScore\":5.0,\"accessVector\":\"NETWORK\",\"accessComplexity\":\"LOW\",\"authentication\":\"NONE\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"PARTIAL\",\"availabilityImpact\":\"NONE\"},\"baseSeverity\":\"MEDIUM\",\"exploitabilityScore\":10.0,\"impactScore\":2.9,\"acInsufInfo\":false,\"obtainAllPrivilege\":false,\"obtainUserPrivilege\":false,\"obtainOtherPrivilege\":false,\"userInteractionRequired\":false}]},\"weaknesses\":[{\"source\":\"security@apache.org\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-23\"}]},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-22\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:flink:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"1.5.1\",\"versionEndExcluding\":\"1.11.3\",\"matchCriteriaId\":\"080CC731-EB0E-4F46-A9A0-D0AB49C84A83\"}]}]}],\"references\":[{\"url\":\"http://www.openwall.com/lists/oss-security/2021/01/05/1\",\"source\":\"security@apache.org\",\"tags\":[\"Mailing 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  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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Detection rules are retrieved from Rulezet.

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